A crankshaft, a scroll compressor and an air conditioner

Abstract

The present invention provides a crankshaft, a scroll compressor and an air conditioner. The crankshaft includes an oil return hole disposed within the crankshaft. An air return hole and an auxiliary bearing oil return hole that are respectively communicated with the oil return hole are provided on the side wall of the crankshaft. A porous medium is disposed on the oil return hole, and the porous medium covers the air return hole. The gas separated by the porous medium can flow out through the air return hole, and the lubricating oil separated by the porous medium can lubricate the structure to be lubricated through the auxiliary bearing oil return hole. This solves the problem in the prior art that when the scroll compressor simultaneously performs backpressure regulation and oil return, oil-gas separation cannot be carried out and the oil return effect is unstable.

Description

Technical Field

[0001] The present invention belongs to the technical field of compressors, and particularly relates to a crankshaft, a scroll compressor and an air conditioner. Background Art

[0002] A scroll compressor is a positive-displacement compressor. During the process of the fixed moving and stationary scrolls moving, the gas pressure in the cavity increases due to gas compression, resulting in the moving and stationary scrolls moving to both sides under the action of force, and a back pressure needs to be applied to the moving scroll for balance. Currently, the industry generally uses a fixed throttle pin to adjust the back pressure. This method can adjust the back pressure, but there is still no good solution for the oil return effect and capacity of the compressor refrigerant oil.

[0003] Currently, the scroll compressors all use the oil return method at the suction end to lubricate the compressor motor and bearings. This structural design can meet the lubrication of the compressor motor part, but the lubrication effect on the compressor auxiliary bearings is not obvious, and the oil return performance requirements for the entire system are relatively high.

[0004] In some technologies, the scroll compressor returns oil while adjusting the back pressure, but it is difficult to separate the oil and gas in this way. Basically, the oil return is in the state of an oil-gas mixture. This oil return method has an unstable effect and increases the power of the compressor. Summary of the Invention

[0005] Therefore, the present invention provides a crankshaft. By arranging a porous medium inside the crankshaft, the oil-gas mixture can be fully separated, the oil return efficiency of the compressor can be improved, and the excessive power of the compressor can be avoided.

[0006] To solve the above problems, according to one aspect of the present application, an embodiment of the present invention provides a crankshaft, which includes an oil return hole arranged inside the crankshaft. An air return hole and an auxiliary bearing oil return hole respectively communicated with the oil return hole are arranged on the side wall of the crankshaft. A porous medium is arranged on the oil return hole, and the porous medium covers the air return hole.

[0007] In some embodiments, the porous medium is made of a non-metallic material, and the porosity of the inner holes of the porous medium is greater than the porosity of the outer holes.

[0008] In some embodiments, the porous medium is made of a metal material, and the porosity of the inner holes of the porous medium is less than the porosity of the outer holes.

[0009] According to another aspect of the present application, an embodiment of the present invention further provides a scroll compressor, and the scroll compressor includes the above-mentioned crankshaft.

[0010] In some embodiments, the scroll compressor further includes a housing, a motor rotor, a bracket, a main bearing, a sub-bearing, a moving scroll, and a stationary scroll installed in the housing. One end of the crankshaft is sleeved on the sub-bearing, and the other end is installed on the bracket through the main bearing. The side wall of the crankshaft is connected to the motor rotor. The moving scroll and the stationary scroll are sequentially installed on the bracket. A back pressure chamber is formed between the moving scroll and the bracket, and the back pressure chamber communicates with an oil return hole.

[0011] In some embodiments, the oil return hole of the sub-bearing communicates the oil return hole with the sub-bearing.

[0012] According to another aspect of the present application, an embodiment of the present invention further provides an air conditioner, and the air conditioner includes the above-mentioned scroll compressor.

[0013] Compared with the prior art, the crankshaft provided by the present invention has at least the following beneficial effects:

[0014] The present invention provides a crankshaft, which includes an oil return hole provided in the crankshaft. An air return hole and an oil return hole of the sub-bearing that are respectively communicated with the oil return hole are provided on the side wall of the crankshaft. A porous medium capable of covering the air return hole is provided on the oil return hole. Through the porous medium, the oil-gas mixture entering the oil return hole can be fully separated, the oil return efficiency of the compressor can be improved, the excessive power of the compressor can be avoided, and the problem that the scroll compressor in the prior art cannot perform oil-gas separation and the oil return effect is unstable when performing back pressure adjustment and oil return simultaneously is solved.

[0015] On the other hand, the scroll compressor provided by the present invention is designed based on the above-mentioned crankshaft, and its beneficial effects can be referred to the beneficial effects of the above-mentioned crankshaft, which will not be elaborated here one by one.

[0016] On the other hand, the air conditioner provided by the present invention is designed based on the above-mentioned scroll compressor, and its beneficial effects can be referred to the beneficial effects of the above-mentioned scroll compressor, which will not be elaborated here one by one.

[0017] The above description is only an overview of the present invention. In order to be able to understand the technical means of the present invention more clearly and implement it according to the content of the specification, the following is a detailed description of the preferred embodiments of the invention in conjunction with the drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the crankshaft provided by the embodiment of the present invention;

[0019] Figure 2 It is a schematic structural diagram of the porous medium in the crankshaft provided by the embodiment of the present invention;

[0020] Figure 3 It is a cross-sectional view of the porous medium in the crankshaft provided by the embodiment of the present invention;

[0021] Figure 4Schematic structural diagram of the scroll compressor provided by the embodiment of the present invention.

[0022] The reference signs are indicated as follows:

[0023] 1, oil return hole; 2, gas return hole; 3, oil return hole for auxiliary bearing; 4, porous medium; 5, housing; 6, motor; 7, bracket; 8, auxiliary bearing; 9, moving scroll; 10, stationary scroll; 11, back pressure chamber; 12, suction port; 13, exhaust port; 14, back pressure passage. Specific embodiments

[0024] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following combines the drawings and preferred embodiments to detail the specific embodiments, structures, features and their effects according to the application of the present invention. In the following description, different "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0025] In the description of the present invention, it should be clear that the terms "vertical", "lateral", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "horizontal", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention, rather than meaning that the indicated device or element must have a specific orientation or position. Therefore, it should not be construed as a limitation to the present invention.

[0026] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0027] See Figures 1 to 4 As shown, this embodiment provides a crankshaft, including an oil return hole 1 provided in the crankshaft. A gas return hole 2 and an oil return hole 3 for the auxiliary bearing are provided on the side wall of the crankshaft and are respectively communicated with the oil return hole 1. A porous medium 4 is provided on the oil return hole 1, and the porous medium 4 covers the gas return hole 2. Specifically, the gas return hole 2 penetrates the side wall of the crankshaft and is communicated with the oil return hole 1. The oil return hole 3 for the auxiliary bearing provided on the crankshaft is also communicated with the oil return hole 1 and is far from the position where the porous medium 4 is located. The porous medium 4 has the function of separating oil and gas. The gas separated by the porous medium 4 can flow through the gas return hole 2 and be discharged, and the lubricating oil separated by the porous medium 4 can lubricate the structure to be lubricated through the oil return hole 3 for the auxiliary bearing.

[0028] In this technical solution, when the oil-gas mixture flows through the oil return hole 1 in the crankshaft, the porous medium 4 is arranged at the oil return inlet of the crankshaft. The porous medium 4 can adsorb the lubricating oil on its surface. Due to the tension effect, the lubricating oil moves towards the center, and the refrigerant moves towards the outside. An air return hole 2 is opened on the side wall of the crankshaft where the porous medium 4 abuts against the oil return hole 1, and the refrigerant can be discharged through the air return hole 2. The lubricating oil condensed in the center of the porous medium 4 flows along the oil return hole 1 to the auxiliary bearing oil return hole 3 to lubricate the structure to be lubricated connected to the auxiliary bearing oil return hole 3, increasing the oil return efficiency. Moreover, the oil return effect in this way is more stable, avoiding too high compressor power. Preferably, the air return hole 2 can be set as an obliquely upward opening to avoid the risk of lubricating oil leakage from the air return hole 2.

[0029] Furthermore, the porous medium 4 can be made of a non-metallic material, and the porosity of the inner holes of the non-metallic material is greater than that of the outer holes; or the porous medium 4 can be made of a metallic material, and the porosity of the inner holes of the metallic material is less than that of the outer holes.

[0030] Specifically, the porous medium 4 in this technical solution is for separating the oil-gas mixture flowing through the oil return hole 1, and the porous medium 4 can be made of a metallic material or a non-metallic material. When the porous medium 4 is made of a non-metallic material, the non-metallic material generally has an oil-repellent property, and the oil surface tension of the oil-repellent property can make the oil move towards the large gap. Therefore, at this time, the porous medium 4 is designed to have a structure with a larger porosity of the inner holes and a smaller porosity of the outer holes as shown in Figure 2 and Figure 3 ; on the contrary, the metallic material generally has an oil-loving property, and the oil surface tension of the oil-loving property can make the oil move towards the small gap. Therefore, when the porous medium 4 is made of a metallic material, the structure of the porous medium 4 needs to be changed, and the porous medium 4 is designed to have a structure with a smaller porosity of the inner holes and a larger porosity of the outer holes.

[0031] Specifically, an installation groove as shown in Figure 1 can also be provided on the oil return hole 1, and the porous medium 4 is arranged in the installation groove. The inner diameter of the installation groove is larger than the inner diameter of the oil return hole 1 to prevent the porous medium 4 from shifting in the oil return hole 1.

[0032] The crankshaft provided in this embodiment can fully separate the oil-gas mixture, improve the oil return efficiency of the compressor, and the oil return effect is stable, and it can supplement lubricating oil to the oil-deficient structure according to the opening position of the auxiliary bearing oil return hole.

[0033] This application also provides a scroll compressor, including the above-mentioned crankshaft.

[0034] Further, the scroll compressor further includes a housing 5, a motor rotor 6, a bracket 7, a main bearing, a sub-bearing 8, a moving scroll 9, and a stationary scroll 10 installed in the housing 5. One end of the crankshaft is sleeved on the sub-bearing 8, and the other end is installed on the bracket 7 through the main bearing. The middle of the crankshaft is connected to the motor rotor 6. The moving scroll 9 and the stationary scroll 10 are sequentially installed on the bracket 7. A back pressure chamber 11 is formed between the moving scroll 9 and the bracket 7, and the back pressure chamber 11 communicates with the oil return hole 1. More specifically, the sub-bearing oil return hole 3 communicates the oil return hole 1 with the sub-bearing 8.

[0035] In this technical solution, as Figure 4 shown, the motor rotor 6 is connected to an external power supply. The refrigerant sucked in from the suction port 12 is sucked into the compression chamber formed by the stationary scroll 10 and the moving scroll 9. The motor rotor 6 drives the crankshaft to rotate, thereby driving the moving scroll 9 to rotate around the stationary scroll 10 to compress the sucked gas. Most of the compressed gas is discharged through the exhaust port 13, and a small part enters the back pressure chamber 11 through the back pressure channel 14, forming a back pressure acting on the back surface of the moving scroll 9, so that the moving scroll 9 and the stationary scroll 10 are in an axially sealed state. As the refrigerant continuously enters, a large amount of oil-gas mixture will remain in the back pressure chamber 11 and needs to be discharged in time. At this time, the porous medium 4 can adsorb the lubricating oil on its surface and transport the lubricating oil in the direction of the motor rotor 6 under the action of pressure. Inevitably, a small amount of refrigerant will be mixed during the transportation. At this time, the porous medium 4 can discharge the excess refrigerant from the air return hole 2, and the remaining lubricating oil will return to the position of the sub-bearing 8 through the oil return hole 1 and the sub-bearing oil return hole 3, and lubricate the sub-bearing 8, which not only improves the oil return efficiency of the compressor, but also can adjust the back pressure of the compressor. And the lubricating oil directly enters the sub-bearing 8 of the scroll compressor, improving the lubrication effect on the sub-bearing 8 and solving the problem of serious wear of the sub-bearing 8.

[0036] More specifically, the porous medium 4 in this technical solution can also act as a throttle valve, and the back pressure can be adjusted by controlling the length of the porous medium 4. Among them, the longer the porous medium 4, the greater the back pressure, and the shorter the porous medium 4, the smaller the back pressure.

[0037] According to the good oil-gas separation effect and the function of adjusting the back pressure of the porous medium 4, the porous medium 4 can also be installed in other positions, such as the bracket, the head cover, etc.

[0038] This application also provides an air conditioner, including the above-mentioned scroll compressor. This kind of air conditioner has less noise and higher reliability.

[0039] The above are only the preferred embodiments of the present invention, and there is no limitation in any form to the present invention. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention. It is easy for those skilled in the art to understand that, on the premise of no conflict, the above-mentioned advantageous technical features can be freely combined and superimposed.

Claims

1. A crankshaft, characterized in that, It includes an oil return hole (1) provided in the crankshaft. An air return hole (2) and an auxiliary bearing oil return hole (3) which are respectively communicated with the oil return hole (1) are provided on the side wall of the crankshaft. A porous medium (4) is arranged on the oil return hole (1), and the porous medium (4) covers the air return hole (2); the gas separated by the porous medium (4) can flow out through the air return hole (2), and the lubricating oil separated by the porous medium (4) can lubricate the structure to be lubricated through the auxiliary bearing oil return hole (3).

2. The crankshaft according to claim 1, wherein The porous medium (4) is a non-metallic material with oil-repellent characteristics, and the porosity of the inner holes of the porous medium (4) is greater than that of the outer holes.

3. The crankshaft according to claim 1, characterized in that, The porous medium (4) is a metal material with oil-loving characteristics, and the porosity of the inner holes of the porous medium (4) is less than that of the outer holes.

4. A scroll compressor, characterized in that, It includes a crankshaft as described in any one of claims 1-3.

5. The scroll compressor according to claim 4, wherein, The scroll compressor further includes a housing (5), a motor rotor (6), a bracket (7), a main bearing, an auxiliary bearing (8), a moving scroll (9), and a stationary scroll (10) installed in the housing (5). One end of the crankshaft is sleeved on the auxiliary bearing (8), and the other end is installed on the bracket (7) through the main bearing. The side wall of the crankshaft is connected to the motor rotor (6). The moving scroll (9) and the stationary scroll (10) are sequentially installed on the bracket (7). A back pressure chamber (11) is formed between the moving scroll (9) and the bracket (7), and the back pressure chamber (11) is communicated with the oil return hole (1).

6. The scroll compressor according to claim 5, wherein, The auxiliary bearing oil return hole (3) communicates the oil return hole (1) with the auxiliary bearing (8).

7. An air conditioner, characterized in that, It includes a scroll compressor as described in any one of claims 4-6.

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